Tire-molding apparatus



Nov. 22, 1927. 1,649,843

J. G. MOOMY TIRE MOLDING APPARATUS Filed April 10, 1922 3 Sheets-Sheet 1 J. G.- MO OMY TIRE MOLDING APPARATUS Nov. 22, 1927.

Filed April 10, 1922 3 Sheets-SheetZ boa 7 7?? z J. G. MOOMY TIRE MOLDING APPARATUS Nov. 22, 1927.

Filed April 10. 1922 3 Sheets-Sheet 3 Patented Nov. 22, 1927.

JOSEPH G. MoomY, F ERIE, PENNSYLVANIA.

TIRE-MOLDING APPARATUS.

Application filed April 10, 1922. Serial No. 550,973.

This invention is designed to mold tires. Such tires are commonly molded in stacks in a vulcanizing chamber, the stack of molds being subjected to pressure from a plunger. Different methods of subjecting the tire during vulcanization to pressure have been used, one of the common methods being to inflate an expansible core with fluid pressure, usually air pressure. here there -1s any leakage or reduction in this pressure from any cause the tires in the process of vulcanization are spoiled or injured. With the present invention an expansible core is used but the expansion is brought about mechanically. Another feature of the invention is the manner of securing the molds so that they may be observed under pressure prior to closing the chamber. Other details of the invention will appear from the specification and claim-s. V

The invention is illustrated in the accompanying drawings as follows Fig. 1 shows a central vertical section through a vulcanizing apparatus.

Fig. 2 a plan view of the chamber with the.

v in a cylinder 25 and the cylmder is mounted cover removed.

Fig. 3 a plan view of a retaining shoulder. Fig. t an enlarged sectional view of the mold with the core expanded devices.

Fig. 5 a section of an alternative construction of spreading device.

Fig. 6 a section on the line 66 in Fig. 4:.

1 marks the vulcanizingchamber, 2 a base in which the chamber is mounted, 3 posts extending from the base and carrying the chamber, 4 the platform in the chamber, and 5 a plunger by which the platform is raised as the tires are placed in the chamber and which exerts pressure on the stack during the vulcanizing.

A stack of molds 7 are shown onthe platform. The top mold engages a removable shoulder 8 in the form of a ring having projections 9, the projections being adapted to pass through openings 10 between shoulders 11 extending from a wall of the chamber. The ring 8 after passed through the openings 10 is turned so as to bring the shoulders 9 under the shoulders 11 thus forming an abutment for the molds against which they are compressed prior to placing the cover 12.

The mold is made up of the sections 13- -13 carrying the pattern for the tread and side having the projections 9.

portions of the tire. The mold is completed by the rings 14 which form the base.- These molds are closed through the pressure of the ram. A tire 15 is shown in section and an expansible core 16 is arranged within the mold. This core is preferably formed of sponge rubber or may be formed of sand or other material which will expand through displacement. Expanders 17 in the formof segments operate between the rings 14 and against the core 16. The segments are spaced apart so as to give clearance to ermit the retracting of the segments and fifiers 17 are placed in the corein position to be spread or forced outwardly by the segments so that when the segments are fully spread the parts are in the form of a ring. These segments are spread throughthe action of the toggle links 18 which are secured to the segments by pins 19 and to heads 21 by pins 20. A bar 22 is passed through the heads 21 so as to center them and is provided at its topv with a shoulder 23 which is engaged by a shoulder 23 on a plunger 24 extending from a piston 24. The piston 2 1 operates on posts 26 extending from the cover 12. Liquid or fluid is delivered through a pipe 27 to the cylinder and puts the heads 21 under pressure and the heads 21 operate through the toggles and expander ring displacing the core and putting the tire under pressure. This pressure follows upthe soft ening action of the rubber so that as the vulcamzing proceeds and the plastic rubber yields the core exerts a following pressure.

I prefer to provide adjusting thimbles 28 on the heads 21 so that they may be utilized for difi'erent sizes of tires.

, The rod or bar 22 may be omitted if detherein; a series of tire molds arranged on the platform; cores in the molds; expanders acting on the cores; spreaders acting on the expanders comprising toggle levers and heads to which the toggle levers are secured;

means for exerting pressure on the heads in unison; and centering devices for the heads.

Q a g 1,649,843

2. In a tire molding apparatus, the combimeans for exerting pressure on the heads in nation of a Vulcanizing chamber; a platform unison; and centering devices for the heads therein; a series of tire molds arranged on comprising a bar extending through the 10 the platform; cores in the molds; expanders heads. T

acting on the cores; Spreaders acting on the In testimony whereof I have hereunto set expanders comprising toggle levers and myhand. i, K 7 heads to which the toggle levers are seciired'; JOSEPH G. MOOMY. 

